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arXiv 1998-04-20 0 views

Multiwavelength observations of 26W20, a radio galaxy which displays BL Lac characteristics

Silverman, J. D. · Harris, D. E. · Junor, W.

Original · EN

26W20, a radio galaxy located at a projected distance of 2.2 Mpc from the center of Abell 754 (z=0.054) exhibits core emission properties similar to those of a BL Lac object. New radio observations and VLA archival data show parsec scale features in the core (Lᵣ approx.10⁴¹) ergs/s with a flat spectrum. From observations with ROSAT, we demonstrate that the X-ray core emission (Lₓ=3X10⁴³) ergs/s is non-thermal and variable. An 18% increase in the X-ray luminosity was observed in two observations separated by five days. The optical morphology is that of a large, normal elliptical galaxy (mᵥ=15.6) and the optical spectrum lacks strong emission lines. If the innermost segment of the radio jet is close to our line of sight, Doppler boosting could explain both the observed X-ray intensity and the absence of emitting line regions.

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